Biology, Volume 2

From inside the book

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Page 71Individuals that are homozygous for a trait possess two identical alleles for that
trait. ... symbol "+" for the regular version of the allele; since each fly has two alleles for each trait, we can represent the genetic make-up of the wildtype fly as
+ / +.

Page 73It was easy to work out the possible combination of alleles when all the male
gametes were one genotype and all the female gametes were another. To work
out all possible combinations of alleles that can arise from crosses in which there
are ...

Page 75If you look at your results, it's obvious that the wildtype character + is “stronger"
than the VG character; in fact, when a fly has one VG allele and one + allele, it is
the + allele that is expressed. The wild-type allele is said to be dominant, while
the ...